There are integral heptagons, no three points on a line, no four on a circle

2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/158335We give two configurations of seven points in the plane, no three points in a line, no four points on a circle with pairwise integral distances. This answers a famous question of Paul Erdős.4 pages, 1 figureCombinatorics52C10 (Primary);52C35,52-04,52A99,51K99 (Secondary)There are integral heptagons, no three points on a line, no four on a circletext